Ivemadeahugemistake

Hello again gents, So after a bit of google-fu I found this ring and pinion chart: I have highlighted the R&P combinations that I assume would work in an R180, please correct me if I am wrong. Any input on which will most likely work best would be highly appreciated so I can start on fabrication. TIA

Hello John, Unfortunately the reverse is true here in the Philippines. A single standard road tire goes for 5,000 to 8,000 PHP (100 to 180 USD) while more performance oriented tires like the Advan AD08 are around 10,000 to 12,000 PHP (220 to 270 USD). The quote I got from the shop to fabricate all three sets of R&Ps is 15,000 PHP for the billets and 10,000 PHP for labor (total of 550 USD). It is cheaper for me to fabricate these parts than to experiment with different tires. Also the engineer who owns the shop owes me one for all the clients I’ve brought him so the deal I get is if the first sets don’t work out all I’ll have to pay for is the billets to do a second attempt. I have to thank you John. If it weren’t for this thread http://forums.hybridz.org/index.php/topic/78123-subaru-wrx-sti-r180-side-axles I wouldn’t even be able to do this. Thank you for designing such quality parts.

Hello everyone, I am new to the forum but have been lurking for a few years and reading as much as humanly possible. I have been working on a Subaru STI R180(3.9 ratio) for my ld28 240Z project and came across this post: http://forums.hybridz.org/topic/36312-turbo-diesel-questions/page-3?do=findComment&comment=289554 stating that his gear ratio is 3.36 is the lowest available for the R180 but more mpg gains could be had if lower ratios existed. That got me thinking if it is possible to fabricate a 3.13, 2.9 and 2.72 ratio ring and pinion set for the STI torsen R180. The machine shop that I go to for most of my custom fabrication needs has all the equipment to fabricate ring and pinion gears. I have brought them the STI 3.9 ring and pinion as well as the stock 240Z 3.36 ring and pinion as a sample and they told me that they just need the proper specifications to fabricate them. From what understand as the ratio lowers the diameter of the pinion increases and the gaps between ring teeth widen. Would the pinion be too large to fit in the housing? Is this the reason there are no lower ratios? I assume that a 3.13 set would be a 31 tooth ring and a 10 tooth pinion, a 2.9 set would be a 29 tooth ring and 10 tooth pinion, and a 2.72 would be a 27 tooth ring and 10 tooth pinion. is this correct? Thanks in advanced for any information